C o1 cl124

where c0 is the speed of light from special relativity. Thus, in order to extend special relativity to accommodate the equivalence of inertial and gravitational mass, Einstein had to modify one of the fundamental postulates of the original theory. Reconciling special relativity with gravity was not going to be easy.

Since the speed of light varies in a gravitational field, it follows from Huygens' principle56 that it will be bent, and Einstein calculated the magnitude of the deflection for a light ray coming from infinity and passing at a distance A

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